Pressure ridges
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Pressure ridges |
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| Ridges are areas of accelerated melting, both on
the sail and the keel. Pictured is a ridge that formed during the shear event of
March 1998. The photos were taken on 17 April and 8 August 1998. The
skipole in the foreground of the April picture is 1.3 m tall. We instrumented a ridge
with a survey line and measured ridge sail ablation every 5-7 days. During July,
sail ablation rates were 1-3 cm per day. Profiles for 7 July and 31 July 1998 are plotted below.
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